Photographic camera



y 11, 1939.- A. s. HOWELL 1 2,165,706

PHOTOGRAPHIC CAMERA Filed Sept. 3, 1937 2 Sheets-Sheet 1 E I-L x Y INVENTEIR ALBERT E1. HUWELL MQMk.

ATTY.

y 1939- A. s. HOWELL 2,165,706

PHOTOGRAPHIG CAMERA Filed Sept. 3, 1937 2 Sheets-Sheet 2 Elli-- IWENTQR imw LL.

Patented July 11, 1939 a UNITED STATES morociuirnic cams Albert s. Howell, Chicago, Ill., assignmto The Bell & Howell Company,

s poration of Illinois Chicago, 111., a cor- Application September a, 1931, Serial No. "masts 3 Claims.

My invention relates to photographic cameras of the interchangeable or removable film magazine type and particularly to motion picture cameras of this type.

It is usual to provide interchangeable film magazines with exposure aperture shutters for'preventing film exposure while the magazines are not mounted on cameras, the aperture shutters being manually actuated to open and close whilethe n magazines are mounted on the cameras.

An obl'ect of my invention residesinthe provision of a simple and effective means whereby the magazine shutters are actuated automatically as an incident of interchange of the magazine on 15 cameras to the end of dispensing with the necessity of manual actuation of the magazine shutters.

With this object in view my invention consists in certain features of novelty in the construction, combination and arrangement of parts by 20 which the said object and certain other objects,

hereinafter appearing, are efi'ected, all as fully described with reference to drawings and more particularly pointed out in the appended claims. 25 In the said drawings Figure 1 is a side elevation of a motion picture camera embodying my invention;

Figure 2 is a vertical sectional view of the same in similar elevation; 30 Figures 3 and 4 are similar sectional views substantially on the line 33 of Figure 1, but showing parts in diflerent positions;

Figure 5 is a perspective view of the magazine shutter actuating spring, hereinafter described; 5 and Figure 6 is a perspective view of one of the" magazine guide springs hereinafter described.

Referring to the drawings, i designates a camera casing of forwardly and rearwardly elongated 40 form within which is secured a forwardly and rearwardly extending frame plate 2 disposed intermediate the sides of the casing and forming the inner side of a film magazine chamber 3.

The magazine chamber portion of the casing is 45 provided with a rearwardly disposed access opening embracing portions of one side, the top, the bottom and rear wall thereof, and a cover l forms these portions of said walls and closes said opening, the side wall portion of the cover being hinged to the corresponding side wall of the casing, as designated at 5, for opening and closing movement and a latch device, generally designated at 6, serving to releasably secure the cover in closed 55 position. See Figures 1 to 4.

the accompanying.

A forwardly and rearwardly elongated film magazine, generally designated at l, is interchangeably insertable in and removable from the film chamber 3 through the rear opening of the film chamber in a predetermined interchange 5 path. The magazine is guided and positioned in the film chamber in the following manner. See Figures 2 to 4.

Two forwardly and rearwardly spaced contact studs I on the bottom wall of the casing engage 10 the bottom of the magazine and a forwardly and rearwardly extending leaf spring 8, within the magazine chamber, has its rear end secured with the upper wall of the casing by means of screws II, and has its intermediateportion bowed downwardly to engage the top of the magazine and maintain the magazine engaged with the contact studs t.

Three. triangularly spaced contact studs I! on the frame plate 2 engage the inner face of the, magazine. A forwardly disposed bow spring i3 secured on the side wall of the casing forming the outer side of the magazine chamber engages the outer face of the magazine and a spring i4 secured on the cover 4 engages, when the cover is closed, the rear outer vertical comer of the magazine in an angular direction with reference to the plane of the magazine, the springs i3 and i4 serving to maintain the magazine in engagement I I with the contact studs I2.

A plate l5, see Figure 2, secured within the ms in at the forward end ofthe magazine chamtherein and an apertured intermittent feed guide,

generally designated at l8, at the front wall thereof and-having an exposure aperture 2|, a film 22 .within the magazine being fed from one film spool through the feed guide and wound on the other film spool for sequential exposure thereof in cooperation with suitable mechanism carried with the camera casing, all asis well known. I

The magazine also carries a shutter mechanism for closing the exposureaperture 2| to the end of rendering the magazine light tight while not installed in the camera. This shutter mechanism as illustrated is of a known type and consists of a flexible metal shutter member 23 slidably carried as an incident in an angled guide 24 for movement to open and close the exposure aperture 26.

The shutter memiier well as guide 26 extend forwardly and rearwarolly along the upper wall of the magazine, and a. stud 25 is secured with the forwardly and. resrwardly extending portion of the shutter memher and projects upward= 1y through a forwardly and rearwardly extending slot 2G through the upper wall the mags.- zine for actuation to open and close the shutter.

The stud 25 is thus actualoie with respect to the magazine in correspondence with the inter-' change path of the magazine to open and close the magazine exposure aperture shutter, rearward movement of the stud 25 with respect to his the magazine opening the shutter and forward movement of the stud with respect tothe magazine closing the shutter. The intermediate portion or the spring is provided with a longitudinaily extending slot 21! through whichthestud 25 passes of interchange of the magazine. A leaf spring 28 is arranged between the spring 9 and the upper wail of the casing i and, extending iorwardly rearwardly, has its rear end secured with the camera casing by means of the screws ii. The spring 283 is provided with a slot at extending longitudinally from the torward end thereofi to form parallel springs 36 between which the stud interchange path. of the magazine and the imward or tree ends thereof are piovicled with opposing cam formations 32 facing transversely of said interchange path and yieldahly engageable with the stud 25 as an incident of interchange movement of the magazine, thus forming a spring pressed cam engagement operative transversely of said interchange path for engagement and disengagement automaticaily as an incident of magazine interchange.

The aforesaid spring pressed cam engagement is operative to eiiect actuation of the stud 25 with respect to the magazine corresponding with the aforesaid interchange path tor shutter actuation,

that is to say shutter closure with removal movement of the magazine and shutter opening with mounting movement of the magamne.

Preferably, the side of the camera casing I forming the outer wall of the magazine chamber is provided with" an inwardly projecting. abutment part engageahie with the stud 25 for effecting positive shutter opening movement oi this stud with mounting movement oi the magazine in case or" failure of the aforesaid spring pressed cam engagement to efiect opening of the shutter, and to provide assured closing of the shutter with removal movement of the magazine, the portions or the cam formations t2 opposing the stud removai movement oi the magazine are relatively steep, as designated at 3 3.

Thus, the magazine shutter is actuated and the shutter actuating camera and magazine parts are engaged disengaged all automatically as an incident or" interchange.

Figures 2 and it show the magazine in exposure position in the camera casing with the stud 25 in shutter opened position and engaged against the abutment-part 33, and Figure 4 shows the magazinepartialiy removed from the magasine with the stud (iii engaged with the portions 3 5 of passes as an incident or interchangeoi the magazine. The springs 39 are operable transversely of the I camera part engaging a shutter part ,movement of said magazine to effect shutter the cam formations 32 preparatory to shutter closure with iurther removal movement of the magazine.

While I have thus described my invention, i do not wish to be limited to the precise details described as changes may be readily made without departing irons the spirit my invention, but having thus described my invention, 1 claim as new and desire to secure by Letters Patent the following:

1. In. a. photographic camera the combination with an exposure apertured film magazine and a camera structure adapted for the interchangeable mounting of said magazine thereon in a. predetermined interchange path, of magazine aperture shutter camera part engaging a shutter part carried on the magazine for movement with respect thereto corresponding with said interchange path, and one of said actuating means parts comprising parallel springs extending longitudinally of and operable transversely of said interchange path and between which the other actuating means part passes as an incident oi interchange move.- ment of said magazine, said springs being provided with opposing cam formations yieldably engageble with said other actuating means part as an incident of said interchange movement.

, 2. In a photographic camera the combination with an exposure apertured film magazine and a camera structure adapted for the interchangeable mounting of said film. magazine thereon in a predetermined interchange path. of magazine aperture shutter actuating means comprising 2 carried on the magazine for movement with respect thereto corresponding with said. interchange path, and said parts comprising a spring pressed cam engagement operative in both directions or said interchange path and yieldalole transversely of said interchange path for engagement and disengagement in both such directions, said cam engagement being relatively steep with removal closure, and an abutment part on said camera structure engages-hie with said magazine part to effect shutter opening with mounting movement of said magazine.

' 3. In a photographic camera the combination with an exposure apertured film magazine and a camera structure adapted for the interchangeable mounting of said magazine thereon .in a predetermined interchange path, of magazine shutter actuating means comprising a camera part engaging a shutter part carried on the magazinc for movement with respect thereto corresponding with said interchange path, and said camera part comprising a spring operable transverselyof said interchange path and provided with a cam formation facing transversely "of sald interchange path for yielding engagement with.

said shutter part in both directions of said intea-change path, the portion of said cam opposing said magazine part with removal movement of said magazine being relatively steep to effect shutter closure, and an abutment part on said camera structure engageable with said magazine part to eiicct shutter opening with mounting movement 0 raid magazine.

ALBERT s. nowzm actuating means comprising a 

